/* Copyright 2012 Mozilla Foundation
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/* globals PDFJS */

'use strict';

var FontInspector = (function FontInspectorClosure() {
    var fonts;
    var active = false;
    var fontAttribute = 'data-font-name';
    function removeSelection() {
        var divs = document.querySelectorAll('div[' + fontAttribute + ']');
        for (var i = 0, ii = divs.length; i < ii; ++i) {
            var div = divs[i];
            div.className = '';
        }
    }
    function resetSelection() {
        var divs = document.querySelectorAll('div[' + fontAttribute + ']');
        for (var i = 0, ii = divs.length; i < ii; ++i) {
            var div = divs[i];
            div.className = 'debuggerHideText';
        }
    }
    function selectFont(fontName, show) {
        var divs = document.querySelectorAll('div[' + fontAttribute + '=' +
                                             fontName + ']');
        for (var i = 0, ii = divs.length; i < ii; ++i) {
            var div = divs[i];
            div.className = show ? 'debuggerShowText' : 'debuggerHideText';
        }
    }
    function textLayerClick(e) {
        if (!e.target.dataset.fontName ||
            e.target.tagName.toUpperCase() !== 'DIV') {
            return;
        }
        var fontName = e.target.dataset.fontName;
        var selects = document.getElementsByTagName('input');
        for (var i = 0; i < selects.length; ++i) {
            var select = selects[i];
            if (select.dataset.fontName !== fontName) {
                continue;
            }
            select.checked = !select.checked;
            selectFont(fontName, select.checked);
            select.scrollIntoView();
        }
    }
    return {
        // Properties/functions needed by PDFBug.
        id: 'FontInspector',
        name: 'Font Inspector',
        panel: null,
        manager: null,
        init: function init() {
            var panel = this.panel;
            panel.setAttribute('style', 'padding: 5px;');
            var tmp = document.createElement('button');
            tmp.addEventListener('click', resetSelection);
            tmp.textContent = 'Refresh';
            panel.appendChild(tmp);

            fonts = document.createElement('div');
            panel.appendChild(fonts);
        },
        cleanup: function cleanup() {
            fonts.textContent = '';
        },
        enabled: false,
        get active() {
            return active;
        },
        set active(value) {
            active = value;
            if (active) {
                document.body.addEventListener('click', textLayerClick, true);
                resetSelection();
            } else {
                document.body.removeEventListener('click', textLayerClick, true);
                removeSelection();
            }
        },
        // FontInspector specific functions.
        fontAdded: function fontAdded(fontObj, url) {
            function properties(obj, list) {
                var moreInfo = document.createElement('table');
                for (var i = 0; i < list.length; i++) {
                    var tr = document.createElement('tr');
                    var td1 = document.createElement('td');
                    td1.textContent = list[i];
                    tr.appendChild(td1);
                    var td2 = document.createElement('td');
                    td2.textContent = obj[list[i]].toString();
                    tr.appendChild(td2);
                    moreInfo.appendChild(tr);
                }
                return moreInfo;
            }
            var moreInfo = properties(fontObj, ['name', 'type']);
            var fontName = fontObj.loadedName;
            var font = document.createElement('div');
            var name = document.createElement('span');
            name.textContent = fontName;
            var download = document.createElement('a');
            if (url) {
                url = /url\(['"]?([^\)"']+)/.exec(url);
                download.href = url[1];
            } else if (fontObj.data) {
                url = URL.createObjectURL(new Blob([fontObj.data], {
                    type: fontObj.mimeType
                }));
                download.href = url;
            }
            download.textContent = 'Download';
            var logIt = document.createElement('a');
            logIt.href = '';
            logIt.textContent = 'Log';
            logIt.addEventListener('click', function (event) {
                event.preventDefault();
                console.log(fontObj);
            });
            var select = document.createElement('input');
            select.setAttribute('type', 'checkbox');
            select.dataset.fontName = fontName;
            select.addEventListener('click', (function (select, fontName) {
                return (function () {
                    selectFont(fontName, select.checked);
                });
            })(select, fontName));
            font.appendChild(select);
            font.appendChild(name);
            font.appendChild(document.createTextNode(' '));
            font.appendChild(download);
            font.appendChild(document.createTextNode(' '));
            font.appendChild(logIt);
            font.appendChild(moreInfo);
            fonts.appendChild(font);
            // Somewhat of a hack, should probably add a hook for when the text layer
            // is done rendering.
            setTimeout(function () {
                if (this.active) {
                    resetSelection();
                }
            }.bind(this), 2000);
        }
    };
})();

// Manages all the page steppers.
var StepperManager = (function StepperManagerClosure() {
    var steppers = [];
    var stepperDiv = null;
    var stepperControls = null;
    var stepperChooser = null;
    var breakPoints = {};
    return {
        // Properties/functions needed by PDFBug.
        id: 'Stepper',
        name: 'Stepper',
        panel: null,
        manager: null,
        init: function init() {
            var self = this;
            this.panel.setAttribute('style', 'padding: 5px;');
            stepperControls = document.createElement('div');
            stepperChooser = document.createElement('select');
            stepperChooser.addEventListener('change', function (event) {
                self.selectStepper(this.value);
            });
            stepperControls.appendChild(stepperChooser);
            stepperDiv = document.createElement('div');
            this.panel.appendChild(stepperControls);
            this.panel.appendChild(stepperDiv);
            if (sessionStorage.getItem('pdfjsBreakPoints')) {
                breakPoints = JSON.parse(sessionStorage.getItem('pdfjsBreakPoints'));
            }
        },
        cleanup: function cleanup() {
            stepperChooser.textContent = '';
            stepperDiv.textContent = '';
            steppers = [];
        },
        enabled: false,
        active: false,
        // Stepper specific functions.
        create: function create(pageIndex) {
            var debug = document.createElement('div');
            debug.id = 'stepper' + pageIndex;
            debug.setAttribute('hidden', true);
            debug.className = 'stepper';
            stepperDiv.appendChild(debug);
            var b = document.createElement('option');
            b.textContent = 'Page ' + (pageIndex + 1);
            b.value = pageIndex;
            stepperChooser.appendChild(b);
            var initBreakPoints = breakPoints[pageIndex] || [];
            var stepper = new Stepper(debug, pageIndex, initBreakPoints);
            steppers.push(stepper);
            if (steppers.length === 1) {
                this.selectStepper(pageIndex, false);
            }
            return stepper;
        },
        selectStepper: function selectStepper(pageIndex, selectPanel) {
            var i;
            pageIndex = pageIndex | 0;
            if (selectPanel) {
                this.manager.selectPanel(this);
            }
            for (i = 0; i < steppers.length; ++i) {
                var stepper = steppers[i];
                if (stepper.pageIndex === pageIndex) {
                    stepper.panel.removeAttribute('hidden');
                } else {
                    stepper.panel.setAttribute('hidden', true);
                }
            }
            var options = stepperChooser.options;
            for (i = 0; i < options.length; ++i) {
                var option = options[i];
                option.selected = (option.value | 0) === pageIndex;
            }
        },
        saveBreakPoints: function saveBreakPoints(pageIndex, bps) {
            breakPoints[pageIndex] = bps;
            sessionStorage.setItem('pdfjsBreakPoints', JSON.stringify(breakPoints));
        }
    };
})();

// The stepper for each page's IRQueue.
var Stepper = (function StepperClosure() {
    // Shorter way to create element and optionally set textContent.
    function c(tag, textContent) {
        var d = document.createElement(tag);
        if (textContent) {
            d.textContent = textContent;
        }
        return d;
    }

    var opMap = null;

    function simplifyArgs(args) {
        if (typeof args === 'string') {
            var MAX_STRING_LENGTH = 75;
            return args.length <= MAX_STRING_LENGTH ? args :
              args.substr(0, MAX_STRING_LENGTH) + '...';
        }
        if (typeof args !== 'object' || args === null) {
            return args;
        }
        if ('length' in args) { // array
            var simpleArgs = [], i, ii;
            var MAX_ITEMS = 10;
            for (i = 0, ii = Math.min(MAX_ITEMS, args.length) ; i < ii; i++) {
                simpleArgs.push(simplifyArgs(args[i]));
            }
            if (i < args.length) {
                simpleArgs.push('...');
            }
            return simpleArgs;
        }
        var simpleObj = {};
        for (var key in args) {
            simpleObj[key] = simplifyArgs(args[key]);
        }
        return simpleObj;
    }

    function Stepper(panel, pageIndex, initialBreakPoints) {
        this.panel = panel;
        this.breakPoint = 0;
        this.nextBreakPoint = null;
        this.pageIndex = pageIndex;
        this.breakPoints = initialBreakPoints;
        this.currentIdx = -1;
        this.operatorListIdx = 0;
    }
    Stepper.prototype = {
        init: function init() {
            var panel = this.panel;
            var content = c('div', 'c=continue, s=step');
            var table = c('table');
            content.appendChild(table);
            table.cellSpacing = 0;
            var headerRow = c('tr');
            table.appendChild(headerRow);
            headerRow.appendChild(c('th', 'Break'));
            headerRow.appendChild(c('th', 'Idx'));
            headerRow.appendChild(c('th', 'fn'));
            headerRow.appendChild(c('th', 'args'));
            panel.appendChild(content);
            this.table = table;
            if (!opMap) {
                opMap = Object.create(null);
                for (var key in PDFJS.OPS) {
                    opMap[PDFJS.OPS[key]] = key;
                }
            }
        },
        updateOperatorList: function updateOperatorList(operatorList) {
            var self = this;

            function cboxOnClick() {
                var x = +this.dataset.idx;
                if (this.checked) {
                    self.breakPoints.push(x);
                } else {
                    self.breakPoints.splice(self.breakPoints.indexOf(x), 1);
                }
                StepperManager.saveBreakPoints(self.pageIndex, self.breakPoints);
            }

            var MAX_OPERATORS_COUNT = 15000;
            if (this.operatorListIdx > MAX_OPERATORS_COUNT) {
                return;
            }

            var chunk = document.createDocumentFragment();
            var operatorsToDisplay = Math.min(MAX_OPERATORS_COUNT,
                                              operatorList.fnArray.length);
            for (var i = this.operatorListIdx; i < operatorsToDisplay; i++) {
                var line = c('tr');
                line.className = 'line';
                line.dataset.idx = i;
                chunk.appendChild(line);
                var checked = this.breakPoints.indexOf(i) !== -1;
                var args = operatorList.argsArray[i] || [];

                var breakCell = c('td');
                var cbox = c('input');
                cbox.type = 'checkbox';
                cbox.className = 'points';
                cbox.checked = checked;
                cbox.dataset.idx = i;
                cbox.onclick = cboxOnClick;

                breakCell.appendChild(cbox);
                line.appendChild(breakCell);
                line.appendChild(c('td', i.toString()));
                var fn = opMap[operatorList.fnArray[i]];
                var decArgs = args;
                if (fn === 'showText') {
                    var glyphs = args[0];
                    var newArgs = [];
                    var str = [];
                    for (var j = 0; j < glyphs.length; j++) {
                        var glyph = glyphs[j];
                        if (typeof glyph === 'object' && glyph !== null) {
                            str.push(glyph.fontChar);
                        } else {
                            if (str.length > 0) {
                                newArgs.push(str.join(''));
                                str = [];
                            }
                            newArgs.push(glyph); // null or number
                        }
                    }
                    if (str.length > 0) {
                        newArgs.push(str.join(''));
                    }
                    decArgs = [newArgs];
                }
                line.appendChild(c('td', fn));
                line.appendChild(c('td', JSON.stringify(simplifyArgs(decArgs))));
            }
            if (operatorsToDisplay < operatorList.fnArray.length) {
                line = c('tr');
                var lastCell = c('td', '...');
                lastCell.colspan = 4;
                chunk.appendChild(lastCell);
            }
            this.operatorListIdx = operatorList.fnArray.length;
            this.table.appendChild(chunk);
        },
        getNextBreakPoint: function getNextBreakPoint() {
            this.breakPoints.sort(function (a, b) { return a - b; });
            for (var i = 0; i < this.breakPoints.length; i++) {
                if (this.breakPoints[i] > this.currentIdx) {
                    return this.breakPoints[i];
                }
            }
            return null;
        },
        breakIt: function breakIt(idx, callback) {
            StepperManager.selectStepper(this.pageIndex, true);
            var self = this;
            var dom = document;
            self.currentIdx = idx;
            var listener = function (e) {
                switch (e.keyCode) {
                    case 83: // step
                        dom.removeEventListener('keydown', listener, false);
                        self.nextBreakPoint = self.currentIdx + 1;
                        self.goTo(-1);
                        callback();
                        break;
                    case 67: // continue
                        dom.removeEventListener('keydown', listener, false);
                        var breakPoint = self.getNextBreakPoint();
                        self.nextBreakPoint = breakPoint;
                        self.goTo(-1);
                        callback();
                        break;
                }
            };
            dom.addEventListener('keydown', listener, false);
            self.goTo(idx);
        },
        goTo: function goTo(idx) {
            var allRows = this.panel.getElementsByClassName('line');
            for (var x = 0, xx = allRows.length; x < xx; ++x) {
                var row = allRows[x];
                if ((row.dataset.idx | 0) === idx) {
                    row.style.backgroundColor = 'rgb(251,250,207)';
                    row.scrollIntoView();
                } else {
                    row.style.backgroundColor = null;
                }
            }
        }
    };
    return Stepper;
})();

var Stats = (function Stats() {
    var stats = [];
    function clear(node) {
        while (node.hasChildNodes()) {
            node.removeChild(node.lastChild);
        }
    }
    function getStatIndex(pageNumber) {
        for (var i = 0, ii = stats.length; i < ii; ++i) {
            if (stats[i].pageNumber === pageNumber) {
                return i;
            }
        }
        return false;
    }
    return {
        // Properties/functions needed by PDFBug.
        id: 'Stats',
        name: 'Stats',
        panel: null,
        manager: null,
        init: function init() {
            this.panel.setAttribute('style', 'padding: 5px;');
            PDFJS.enableStats = true;
        },
        enabled: false,
        active: false,
        // Stats specific functions.
        add: function (pageNumber, stat) {
            if (!stat) {
                return;
            }
            var statsIndex = getStatIndex(pageNumber);
            if (statsIndex !== false) {
                var b = stats[statsIndex];
                this.panel.removeChild(b.div);
                stats.splice(statsIndex, 1);
            }
            var wrapper = document.createElement('div');
            wrapper.className = 'stats';
            var title = document.createElement('div');
            title.className = 'title';
            title.textContent = 'Page: ' + pageNumber;
            var statsDiv = document.createElement('div');
            statsDiv.textContent = stat.toString();
            wrapper.appendChild(title);
            wrapper.appendChild(statsDiv);
            stats.push({ pageNumber: pageNumber, div: wrapper });
            stats.sort(function (a, b) { return a.pageNumber - b.pageNumber; });
            clear(this.panel);
            for (var i = 0, ii = stats.length; i < ii; ++i) {
                this.panel.appendChild(stats[i].div);
            }
        },
        cleanup: function () {
            stats = [];
            clear(this.panel);
        }
    };
})();

// Manages all the debugging tools.
var PDFBug = (function PDFBugClosure() {
    var panelWidth = 300;
    var buttons = [];
    var activePanel = null;

    return {
        tools: [
          FontInspector,
          StepperManager,
          Stats
        ],
        enable: function (ids) {
            var all = false, tools = this.tools;
            if (ids.length === 1 && ids[0] === 'all') {
                all = true;
            }
            for (var i = 0; i < tools.length; ++i) {
                var tool = tools[i];
                if (all || ids.indexOf(tool.id) !== -1) {
                    tool.enabled = true;
                }
            }
            if (!all) {
                // Sort the tools by the order they are enabled.
                tools.sort(function (a, b) {
                    var indexA = ids.indexOf(a.id);
                    indexA = indexA < 0 ? tools.length : indexA;
                    var indexB = ids.indexOf(b.id);
                    indexB = indexB < 0 ? tools.length : indexB;
                    return indexA - indexB;
                });
            }
        },
        init: function init() {
            /*
             * Basic Layout:
             * PDFBug
             *  Controls
             *  Panels
             *    Panel
             *    Panel
             *    ...
             */
            var ui = document.createElement('div');
            ui.id = 'PDFBug';

            var controls = document.createElement('div');
            controls.setAttribute('class', 'controls');
            ui.appendChild(controls);

            var panels = document.createElement('div');
            panels.setAttribute('class', 'panels');
            ui.appendChild(panels);

            var container = document.getElementById('viewerContainer');
            container.appendChild(ui);
            container.style.right = panelWidth + 'px';

            // Initialize all the debugging tools.
            var tools = this.tools;
            var self = this;
            for (var i = 0; i < tools.length; ++i) {
                var tool = tools[i];
                var panel = document.createElement('div');
                var panelButton = document.createElement('button');
                panelButton.textContent = tool.name;
                panelButton.addEventListener('click', (function (selected) {
                    return function (event) {
                        event.preventDefault();
                        self.selectPanel(selected);
                    };
                })(i));
                controls.appendChild(panelButton);
                panels.appendChild(panel);
                tool.panel = panel;
                tool.manager = this;
                if (tool.enabled) {
                    tool.init();
                } else {
                    panel.textContent = tool.name + ' is disabled. To enable add ' +
                                        ' "' + tool.id + '" to the pdfBug parameter ' +
                                        'and refresh (seperate multiple by commas).';
                }
                buttons.push(panelButton);
            }
            this.selectPanel(0);
        },
        cleanup: function cleanup() {
            for (var i = 0, ii = this.tools.length; i < ii; i++) {
                if (this.tools[i].enabled) {
                    this.tools[i].cleanup();
                }
            }
        },
        selectPanel: function selectPanel(index) {
            if (typeof index !== 'number') {
                index = this.tools.indexOf(index);
            }
            if (index === activePanel) {
                return;
            }
            activePanel = index;
            var tools = this.tools;
            for (var j = 0; j < tools.length; ++j) {
                if (j === index) {
                    buttons[j].setAttribute('class', 'active');
                    tools[j].active = true;
                    tools[j].panel.removeAttribute('hidden');
                } else {
                    buttons[j].setAttribute('class', '');
                    tools[j].active = false;
                    tools[j].panel.setAttribute('hidden', 'true');
                }
            }
        }
    };
})();
